Date: Tue, 16 Jul 2013 09:59:35 -0400 (EDT)
From: Vince Weaver <vince@deater.net>
To: Linus Torvalds <torvalds@linux-foundation.org>
cc: Dave Jones <davej@redhat.com>, Linux Kernel <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Oleg Nesterov <oleg@redhat.com>, Ben Myers <bpm@sgi.com>,
        xfs@oss.sgi.com
Subject: Re: splice vs execve lockdep trace.
In-Reply-To: <CA+55aFxiGXht8+Dox=C2ezYYf1yMaLAzMYr40j=+peP8j5Ha6w@mail.gmail.com>
Message-ID: <alpine.DEB.2.02.1307160956370.15153@pianoman.cluster.toy>
References: <20130716015305.GB30569@redhat.com> <CA+55aFyLbqJp0-=7=HOF9sKGOHwsa7A7-V76b8tbsnra8Z2=-w@mail.gmail.com> <20130716023847.GA31481@redhat.com> <CA+55aFxiGXht8+Dox=C2ezYYf1yMaLAzMYr40j=+peP8j5Ha6w@mail.gmail.com>
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On Mon, 15 Jul 2013, Linus Torvalds wrote:

> On Mon, Jul 15, 2013 at 7:38 PM, Dave Jones <davej@redhat.com> wrote:
> 
> > Interestingly, the 'soft lockups' I was
> > seeing all the time on that box seem to have gone into hiding.
> 
> Honestly, I'm somewhat inclined to blame the whole perf situation, and
> saying that we hopefully got that fixed. In between the silly do_div()
> buglets and all the indications that the time was spent in nmi
> handlers, I'd be willing to just ignore them as false positives
> brought on by the whole switch to the perf irq..

Did the perf soft lockups go away with 3.11-rc1?

734df5ab549ca44f40de0f07af1c8803856dfb18 finally got committed,
and it fixes a major long-standing perf-related NMI soft lockup bug I 
found when fuzzing.

Vince
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